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@@ -1183,6 +1183,8 @@ Once keys are moved to YubiKey, they cannot be moved again! Create an **encrypte As an additional backup measure, consider using a [paper copy](https://www.jabberwocky.com/software/paperkey/) of the keys. The [Linux Kernel Maintainer PGP Guide](https://www.kernel.org/doc/html/latest/process/maintainer-pgp-guide.html#back-up-your-master-key-for-disaster-recovery) points out that such printouts *are still password-protected*. It recommends to *write the password on the paper*, since it will be unlikely that you remember the original key password that was used when the paper backup was created. Obviously, you need a really good place to keep such a printout. +It is strongly recommended to keep even encrypted OpenPGP private key material offline to deter [key overwriting attacks](https://www.kopenpgp.com/), for example. + **Linux** Attach another external storage device and check its label: |